That's a casting number. The numbers you are looking for are on the axle tube, between the center carrier and the backing plate. They are usually on the side facing forward, but can be almost anywhere on that tube. They will be recessed from a hand held stamp, not raised as part of the casting.
Here's a pic of the assembly code you are looking for.
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
Last edited by Too Many Projects; 04-19-2021 at 12:56 AM.
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